disodium sulphide
- Formula: Na2S
- Molecular weight: 78.045
- CAS Registry Number: 1313-82-2
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Condensed phase thermochemistry data
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -77.424 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 30.511 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -87.500 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 23.00 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1978 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 1445. to 3000. |
|---|---|
| A | 22.00000 |
| B | -0.000011 |
| C | 0.000004 |
| D | -5.532529×10-7 |
| E | -0.000003 |
| F | -84.68069 |
| G | 55.64675 |
| H | -77.42352 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1978 |
Solid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1000. | 1000. to 1276. | 1276. to 1445. |
|---|---|---|---|
| A | 18.73513 | 13867.88 | -129545.9 |
| B | 3.333700 | -25021.27 | 188602.1 |
| C | 0.658050 | 16739.29 | -103227.1 |
| D | -0.561183 | -3913.671 | 20134.89 |
| E | 0.001984 | -1650.069 | 24717.02 |
| F | -93.23208 | -7681.405 | 89211.04 |
| G | 44.66587 | 17179.30 | -131343.7 |
| H | -87.50000 | -87.50000 | -87.50000 |
| Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1978 | Data last reviewed in March, 1978 | Data last reviewed in March, 1978 |
References
Go To: Top, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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